package org.reenscape.lib;
public class stream {

	public stream() {
	}

	public stream(byte abyte0[]) {
		buffer = abyte0;
		currentOffset = 0;
	}

	public byte readSignedByteA() {
		return (byte)(buffer[currentOffset++] - 128);
	}

	public byte readSignedByteC() {
		return (byte)(-buffer[currentOffset++]);
	}

	public byte readSignedByteS() {
		return (byte)(128 - buffer[currentOffset++]);
	}

	public int readUnsignedByteA() {
		return buffer[currentOffset++] - 128 & 0xff;
	}

	public int readUnsignedByteC() {
		return -buffer[currentOffset++] & 0xff;
	}

	public int readUnsignedByteS() {
		return 128 - buffer[currentOffset++] & 0xff;
	}

	public void writeByteA(int i) {
		buffer[currentOffset++] = (byte)(i + 128);
	}

	public void writeByteS(int i) {
		buffer[currentOffset++] = (byte)(128 - i);
	}

	public void writeByteC(int i) {
		buffer[currentOffset++] = (byte)(-i);
	}

	public int readSignedWordBigEndian() {
		currentOffset += 2;
		int i = ((buffer[currentOffset - 1] & 0xff) << 8) + (buffer[currentOffset - 2] & 0xff);
		if(i > 32767) {
			i -= 0x10000;
		}
		return i;
	}

	public int readSignedWordA() {
		currentOffset += 2;
		int i = ((buffer[currentOffset - 2] & 0xff) << 8) + (buffer[currentOffset - 1] - 128 & 0xff);
		if(i > 32767) {
			i -= 0x10000;
		}
		return i;
	}

	public int readSignedWordBigEndianA() {
		currentOffset += 2;
		int i = ((buffer[currentOffset - 1] & 0xff) << 8) + (buffer[currentOffset - 2] - 128 & 0xff);
		if(i > 32767)
			i -= 0x10000;
		return i;
	}

	public int readUnsignedWordBigEndian() {
		currentOffset += 2;
		return ((buffer[currentOffset - 1] & 0xff) << 8) + (buffer[currentOffset - 2] & 0xff);
	}

	public int readUnsignedWordA() {
		currentOffset += 2;
		return ((buffer[currentOffset - 2] & 0xff) << 8) + (buffer[currentOffset - 1] - 128 & 0xff);
	}

	public int readUnsignedWordBigEndianA() {
		currentOffset += 2;
		return ((buffer[currentOffset - 1] & 0xff) << 8) + (buffer[currentOffset - 2] - 128 & 0xff);
	}

	public void writeWordBigEndianA(int i) {
		buffer[currentOffset++] = (byte)(i + 128);
		buffer[currentOffset++] = (byte)(i >> 8);
	}

	public void writeWordA(int i) {
		buffer[currentOffset++] = (byte)(i >> 8);
		buffer[currentOffset++] = (byte)(i + 128);
	}

	public void writeWordBigEndian_dup(int i) {
		buffer[currentOffset++] = (byte)i;
		buffer[currentOffset++] = (byte)(i >> 8);
	}

	public int readDWord_v1() {
		currentOffset += 4;
		return ((buffer[currentOffset - 2] & 0xff) << 24) + ((buffer[currentOffset - 1] & 0xff) << 16) + ((buffer[currentOffset - 4] & 0xff) << 8) + (buffer[currentOffset - 3] & 0xff);
	}

	public int readDWord_v2() {
		currentOffset += 4;
		return ((buffer[currentOffset - 3] & 0xff) << 24) + ((buffer[currentOffset - 4] & 0xff) << 16) + ((buffer[currentOffset - 1] & 0xff) << 8) + (buffer[currentOffset - 2] & 0xff);
	}

	public void writeDWord_v1(int i) {
		buffer[currentOffset++] = (byte)(i >> 8);
		buffer[currentOffset++] = (byte)i;
		buffer[currentOffset++] = (byte)(i >> 24);
		buffer[currentOffset++] = (byte)(i >> 16);
	}

	public void writeDWord_v2(int i) {
		buffer[currentOffset++] = (byte)(i >> 16);
		buffer[currentOffset++] = (byte)(i >> 24);
		buffer[currentOffset++] = (byte)i;
		buffer[currentOffset++] = (byte)(i >> 8);
	}

	public void readBytes_reverse(byte abyte0[], int i, int j) {
		for(int k = (j + i) - 1; k >= j; k--) {
			abyte0[k] = buffer[currentOffset++];

		}
	}

	public void writeBytes_reverse(byte abyte0[], int i, int j) {
		for(int k = (j + i) - 1; k >= j; k--)
			buffer[currentOffset++] = abyte0[k];

	}

	public void readBytes_reverseA(byte abyte0[], int i, int j) {
		for(int k = (j + i) - 1; k >= j; k--)
			abyte0[k] = (byte)(buffer[currentOffset++] - 128);

	}

	public void writeBytes_reverseA(byte abyte0[], int i, int j) {
		for(int k = (j + i) - 1; k >= j; k--)
			buffer[currentOffset++] = (byte)(abyte0[k] + 128);

	}

	public void createFrame(int id) {
		buffer[currentOffset++] = (byte)(id + packetEncryption.getNextKey());
	}

	private static final int frameStackSize = 10;
	private int frameStackPtr = -1;
	private int frameStack[] = new int[frameStackSize];
	public void createFrameVarSize(int id){ // creates a variable sized frame
		buffer[currentOffset++] = (byte)(id + packetEncryption.getNextKey());
		buffer[currentOffset++] = 0;		// placeholder for size byte
		if(frameStackPtr >= frameStackSize-1) {
			throw new RuntimeException("Stack overflow");
		}
		else frameStack[++frameStackPtr] = currentOffset;
	}
	public void createFrameVarSizeWord(int id) { // creates a variable sized frame
		buffer[currentOffset++] = (byte)(id + packetEncryption.getNextKey());
		writeWord(0);		// placeholder for size word
		if(frameStackPtr >= frameStackSize-1) {
			throw new RuntimeException("Stack overflow");
		}
		else frameStack[++frameStackPtr] = currentOffset;
	}

	public void endFrameVarSize() {// ends a variable sized frame
		if(frameStackPtr < 0) throw new RuntimeException("Stack empty");
		else writeFrameSize(currentOffset - frameStack[frameStackPtr--]);
	}

	public void endFrameVarSizeWord() { // ends a variable sized frame
		if(frameStackPtr < 0) throw new RuntimeException("Stack empty");
		else writeFrameSizeWord(currentOffset - frameStack[frameStackPtr--]);
	}

	public void writeByte(int i) {
		buffer[currentOffset++] = (byte)i;
	}

	public void writeWord(int i) {
		buffer[currentOffset++] = (byte)(i >> 8);
		buffer[currentOffset++] = (byte)i;
	}

	public void writeWordBigEndian(int i) {
		buffer[currentOffset++] = (byte)i;
		buffer[currentOffset++] = (byte)(i >> 8);
	}

	public void write3Byte(int i) {
		buffer[currentOffset++] = (byte)(i >> 16);
		buffer[currentOffset++] = (byte)(i >> 8);
		buffer[currentOffset++] = (byte)i;
	}

	public void writeDWord(int i) {
		buffer[currentOffset++] = (byte)(i >> 24);
		buffer[currentOffset++] = (byte)(i >> 16);
		buffer[currentOffset++] = (byte)(i >> 8);
		buffer[currentOffset++] = (byte)i;
	}

	public void writeDWordBigEndian(int i) {
		buffer[currentOffset++] = (byte)i;
		buffer[currentOffset++] = (byte)(i >> 8);
		buffer[currentOffset++] = (byte)(i >> 16);
		buffer[currentOffset++] = (byte)(i >> 24);
	}

	public void writeQWord(long l) {
		buffer[currentOffset++] = (byte)(int)(l >> 56);
		buffer[currentOffset++] = (byte)(int)(l >> 48);
		buffer[currentOffset++] = (byte)(int)(l >> 40);
		buffer[currentOffset++] = (byte)(int)(l >> 32);
		buffer[currentOffset++] = (byte)(int)(l >> 24);
		buffer[currentOffset++] = (byte)(int)(l >> 16);
		buffer[currentOffset++] = (byte)(int)(l >> 8);
		buffer[currentOffset++] = (byte)(int)l;
	}

	/**
	* Writes a string.
	@deprecated
	*/
	public void writeString(java.lang.String s) {
		s.getBytes(0, s.length(), buffer, currentOffset);
		currentOffset += s.length();
		buffer[currentOffset++] = 10;
	}

	public void writeBytes(byte abyte0[], int i, int j) {
		for(int k = j; k < j + i; k++)
			buffer[currentOffset++] = abyte0[k];

	}

	public void writeFrameSize(int i) {
		buffer[currentOffset - i - 1] = (byte)i;
	}

	public void writeFrameSizeWord(int i) {
		buffer[currentOffset - i - 2] = (byte)(i >> 8);
		buffer[currentOffset - i - 1] = (byte)i;
	}

	public int readUnsignedByte() {
		return buffer[currentOffset++] & 0xff;
	}

	public byte readSignedByte() {
		return buffer[currentOffset++];
	}

	public int readUnsignedWord() {
		currentOffset += 2;
		return ((buffer[currentOffset - 2] & 0xff) << 8) + (buffer[currentOffset - 1] & 0xff);
	}

	public int readSignedWord() {
		currentOffset += 2;
		int i = ((buffer[currentOffset - 2] & 0xff) << 8) + (buffer[currentOffset - 1] & 0xff);
		if(i > 32767) {
			i -= 0x10000;
		}
		return i;
	}

	public int readDWord() {
		currentOffset += 4;
		return ((buffer[currentOffset - 4] & 0xff) << 24) + ((buffer[currentOffset - 3] & 0xff) << 16) + ((buffer[currentOffset - 2] & 0xff) << 8) + (buffer[currentOffset - 1] & 0xff);
	}

	public long readQWord() {
		long l = (long)readDWord() & 0xffffffffL;
		long l1 = (long)readDWord() & 0xffffffffL;
		return (l << 32) + l1;
	}

	public java.lang.String readString() {
		int i = currentOffset;
		while(buffer[currentOffset++] != 10) ;
		return new String(buffer, i, currentOffset - i - 1);
	}

	public void readBytes(byte abyte0[], int i, int j) {
		for(int k = j; k < j + i; k++)
			abyte0[k] = buffer[currentOffset++];

	}

	public void initBitAccess() {
		bitPosition = currentOffset * 8;
	}

	public void writeBits(int numBits, int value) {
		int bytePos = bitPosition >> 3;
		int bitOffset = 8 - (bitPosition & 7);
		bitPosition += numBits;

		for(; numBits > bitOffset; bitOffset = 8) {
			buffer[bytePos] &= ~ bitMaskOut[bitOffset];		// mask out the desired area
			buffer[bytePos++] |= (value >> (numBits-bitOffset)) & bitMaskOut[bitOffset];

			numBits -= bitOffset;
		}
		if(numBits == bitOffset) {
			buffer[bytePos] &= ~ bitMaskOut[bitOffset];
			buffer[bytePos] |= value & bitMaskOut[bitOffset];
		} else {
			buffer[bytePos] &= ~ (bitMaskOut[numBits]<<(bitOffset - numBits));
			buffer[bytePos] |= (value&bitMaskOut[numBits]) << (bitOffset - numBits);
		}
	}

	public void finishBitAccess() {
		currentOffset = (bitPosition + 7) / 8;
	}

	public byte buffer[] = null;
	public int currentOffset = 0;
	public int bitPosition = 0;

	public static int bitMaskOut[] = new int[32];
	static {
		for(int i = 0; i < 32; i++)
			bitMaskOut[i] = (1 << i) - 1;
	}

	public Cryption packetEncryption = null;

}
